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In Double Shear

Appendix VI.

>

and -7 =

/s

1077

2-05

.-. When

 = >-i6

J s

t =

So that below i'o5// thickness the bearing stress is more than
twice the shear. The full value of the shear is, however, rarely
reckoned upon; indeed, the joint is usually treated as though it

i     -Z    -3   -4   -5

niiir

PL* T

7 -e

1  i

THICKNESS

i

. 955.

were in single shear, though of a better construction than a lap
joint* The Board of Trade adopt the number 175 as the ratio
of fy =/g, but even then, as will be seen from the design in
Kg. 955, all butt joints below *8 in. plate must necessarily be
treated as lap joints.